Precision measurement ultrashort laser pulse time synchronization equipment

Abstract

The present invention relates to a precision measurement equipment of altrashort laser pulse time synchronization. It makes special two ultrashort laser pulse which are from different directions and collected at one point pass through a thin reflection-transmission lens and output to form a beam of collinear laser beams, then make it pass through a 1 / 4 wave plate and polaroid and divide it into two beams of laser whose intensities are identical and polarization directions are mutually perpendicular, then makes said two beams of laser income into a nonlinear crystal, and utilizes interaction between pulses in the nonlinear crystal to obtain a series of secondary harmonic pulses, the utilizes a linear array CCD connected with oscilloscope to measure spacial distribution of secondary hoarmonic pulses.

Description

Technical field: [0001] The invention is a device for accurately measuring the time synchronization or delay between two ultrashort laser pulses converged at a certain point in space, and is mainly suitable for precise measurement of two ultrashort lasers with the same wavelength and the same polarization direction or perpendicular to each other The length of the time delay between pulse convergence at a certain point in space is used in the field of laser research. Background technique: [0002] In some important applications of ultrashort laser pulses, such as physical experiments on the interaction between ultrashort laser pulses and matter and ultrashort laser pulse micromachining experiments, it is required that two lasers with different strengths have the same working wavelength and the same polarization direction or are perpendicular to each other. Ultrashort laser pulses converge into one point in space, and require a certain time interval between ultrashort laser pu...

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Problems solved by technology

[0003] In the above device, the delay between pulses is indirectly obtained by measuring the moving distance, but the measurement accuracy of the mobile platform or vernier caliper is generally up to 10 μm, and the measurement accuracy relative to time is >33fs, and there are mechanical errors and reading errors, etc. Error, this accuracy is not enough for the adjustment and measurement of the synchronous delay between ultra-short pulses with a pulse width <50fs. There is also a device that uses piezoelectric ceramics to control the delay optical path to obtain high accuracy, but The reading is inconvenient and expensive, and the moving distance of piezoelectric ceramics is limited, generally tens of microns, and the corresponding dynamic range for measuring the interval between ultrashort pulses is within 500 femtoseconds, and both require a distance between two beams of light. Only when the polarization directions are perpendicular to each other can the phase matching condition of type II be met to generate the second harmonic

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